Pump construction



N0V- 3, 1953 J. G. BAKER ETAL PUMP CONSTRUCTION 3 Sheets-Sheet l FiledV June 2, 194e C- "Tuli NVEN-rovm ejchw Gor-dow maker* L .ge-H L oui S T. wat r Nov.-3, 1953 J, G l BAKER ETAL 2,657,633

PUMP CONSTRUCTION Filed June 2, 1948 5 Sheets-Sheet 2 Nov. 3, 1953 J. G. BAKER ETAL 2,657,633

PUMP coNsTRUcTIoN Filed June 2, 1948 3 Sheets-Sheet 5 doh Gor-4cm cskew Latem C. Tu1l Loums V- (3V-@Ig Patented Nov. 3, 1953 UNITED STAT ES PATENT OFFICE PUMP CONSTRUCTION John GordonBa'ker and Lyelll G. Tllis, Evansville;v and Louisl Watryf Madison, Wiss. assignors to Baker Manufacturing ompany, Evansville; Wisl, acor'poration. of Wisconsin- Application` J ilyZ', 1948, Serial-Nd: 36%6'54 lThisv invention relates to` Water pumps of the so-called' pitless type in' which all of the'operat'- ing parts of the pump proper are assembled in a unit Whichf may be inserted in: and' withdrawn from the well. casing; which extends upwardly above' thel ground surface. In such` pumps; the water is discharged. laterally through anV openingin the casing andtheinternal surfaces of the latterA above and below` the opening: are sealed against the-exterior of. ai discharge he'adwhiclris removable from the casingwith the pump unl-t.

The general object' is to provide af pumpfcoristruction of thel above character whichissubstantially cheaper to manufacture and install than prior pitless constructions and which: may be removed readily forfinspectionorrepa-ir ofi all of the operating' partsV and then: replaced in'l the well? casing Without danger of damaging' any` of the sealing surfaces.

Another' object is to construct the.A removable discharge/head and thecooperating easing surfaces in a novelfmannersuch'as to? mechanically protect the seals duringI insertion or removal of the pump unit.

Still another" object iste-provide avs'ea'lconstruction which is usable diierent types of water pumps` including: deepwell, shallow' well, jet, etc., and facilitates ready conversion of: a shallow Well pump intoa deep w'ell pump.

A further objectv is to provide' a' deep wel-l'ltyp'e of reciprocating: puinpin` which the loaden' the amountl of air is alwaysdeliveredi tothe distributing system along with the-water'.

Other objects and advantages of theinvention will. become apparent from the followingv detailed description taken in connection with` the-accompanying drawings,v in which Figure. 1 is a fragmentary Vertical sectional View of a deep well casingVv and waterpumpincorp'orating the novel features of t'hep'resent'invention, the-section being. taken along. the'line I-I'of Fig. 2.

Fig. 2y is a plan-section taken along the line 2--2 of Fig. l.

Fig. 3 is an enlarged fragmentary section'taken along the line 3 3 ofrFig; 2.

Fig. 4 is a fragmentary -view'similar to Fig; 1 showing a.: shallow Well.v pump installation;v

Fig. 5 is a similar View of the installation-r for a. pump of the-jet type;

While the` invention in its several aspects.- is applicable toV various Water pumps includingldeep Well, shallow well,4 and jet type and is susceptible 2. oi various modincations. and alternative con struotionsg. we' have shown in= the drawings and ill/ill describev herein preferred embodiments as applied to certain-types of pumps. Itis toY be understood that werdo not' intend to limit the in'- vention by such disclosure but aim tocover all modicatio'nsf, alternative constructions, and uses falling' within the spiritand scope ofA the: invention as expressed in the appended claims.

Referring first 'to Figs lfv to 3, the. deepwell pump installation there sho-Wnrincludes the usual tubular casing lwhich extends upwardly through theground to'apoint above aisurace platform@ and is covered by' a cap '1fy which supports the power dri-ven actuator (not shown)- oy whichtlie pump irod 8 israised-arid lowered; Hereinthe-cap isiclampedfremovably against the casing endby bolts-19 etxending through lugs on tlie'casingv and cap. The casing is composed of upper and lower pipe'isections joinedbelow the'groundfsuriace as by welds l-'Ufto'opposite ends-of a distributor head orf: sleeve i: lK formedlinterin'ediate its ends with an outlet` holey I2.l through which the-*pumped water is.deliverect4 under pressurer- A ring i3 securedv to the exterior of thel sleeve around thef hole is threaded internally to receive-'the end of anloutlet-pipe Hl which extends horizontally through anadjacent building wall to the. usuali air bell of a- Water distributingisystem;

The usual drop pipe: l5 issuspended within the casing @from v a hollow" packing llead'inV the form of a spool I6 disposed within the sleeve ill and removably sealedv Withinf the latter both above and -f bel-ow tlf-1e. water outlet |21. The interiorY of the spoolxcommunicates with the casing outlet |2v through' a hole* inithef' center or core of the spool-1 and an Aannular externalgr'oove! E18fr around tlicoore;

Herein; theilowerl'endlothelsp'ool is threaded internally' forfconrectionwith: the dropl pipe i5, while thief upper: spool end slidablyf receives' the lower end-1 ofl extensionl pipe li whichA is clamped iiith'e-'spoblby screws llient'ered' through externallugsilll The: upper' endof: the pipe! ii?- is slid'aloly' receivedfl inL tlie borerk of thev cap lf and an externalf lue 23?' on the? pipeL bearsagainst an adjustable stopi241onl thefc'ap.

watertight@ seals around oppositee'ri'ds o': the spool are formed by so-called ringfs- 2li of yieldable: materials such.: as rubberM seated in grooves 26'aroundthevspoolanges 2d and projecting outwardly therefrom against smooth cylindrical surfaces i281 on shallow? llangesorribs 2li? formedaround-the. interior of thesleeve it. The sleeve-surfaces aresomewhat smaller indiameter than the upper section of the well casing and, after finish machining, are preferably electroplated to provide a smooth corrosion resistant finish against which the seal rings become compressed tightly as the spool is lowered through the upper casing section into position within the sleeve. Herein, this position is determined by engagement of the lower end of the spool itself with an upwardly facing abutment 29 formed on the sleeve la and projecting inwardly beyond the lower sealing surface 2S.

To prevent the seal rings from rubbing against the rough internal surface of the casing 5 as the spool I6 is being inserted or removed, angularly spaced outwardly projecting centering elements are formed around the upper end of the spool above the upper ring 25 so as to be disposed above the upper sleeve surface 28 when the spool encounters the stop 29. Herein, the lugs or centering elements are joined together and form a rigid continuous peripheral ange 3E) which is of larger diameter than the rings 25 when the latter are uncompressed and smaller than the internal diameter Yof the well casing. Thus, the flange centers the spool in the pipe during insertion of the pump unit thereby holding the sealing material out of rubbing contact with the unmachinccl surfaces of the well casing.

To protect the lower seal ring 25 against rubbing across the inner end of the outlet I2, the sleeve Il is bored out as indicated at 32 between the surfaces 28 and across the outlet I2 to a depth greater than the expansion of the rings 25 when the latter are free. Thus, in the movement of the spool into and out of the sleeve I I, the lower seal ring 25 contacts only .the smooth cylindrical surfaces 28 and the finished bevels 33 on opposite sides thereof.

As in the case of prior deep well reciprocating pumps, the pump proper comprises generally an automatic foot valve Sli at the lower end of the drop pipe i5 and a lower piston 35 and associated automatic valve 36 and an upper piston 31 which is connected to the lower piston by a rod 38 eX- tending upwardly through the spool i6. The upper piston is connected to the power reciprocated pump rod 8 and, preferably, reciprocates in a cylinder formed by a liner 39 in the lower end portion of the pipe I9. In a similar way, a liner lill in the drop pipe forms the cylinder for the lower piston 35.

In one of its aspects, the present invention contemplates a novel sizing of the pistons 3,5 and 3T and the use of a check valve lll coacting with i.

the pistons to enable the stroke loads on the power actuator to be equalized and to enable the pistons to perform the additional function of an air pump. To this end, the upper piston 31 is made slightly larger than the lower piston so that on the upward stroke of the pump rod 3, the added displacement of the upper piston will cause a desired amount of air to be drawn into the chamber between the pistons and thus discharged along with the water in the neXt down stroke. The difference in the piston diameters may Vary somewhat according to the requirements of a given installation being about 1A; of an inch in the present instance.

For several reasons, the check valve 4I is mounted on the spool IS and disposed in the annular recess I8. The valve comprises a disk 42 of somewhat yieldable material mounted for bodily movement into and out of abutting engagement with a seat ISS machined on the spool core at the outer end of the passage I'I therethrough.

To minimize the over-all radial dimensions of the mouting, the valve disk :i2 is carried by a plate 43 pivotally connected by a vertical pin 44 to the arms of a yoke i5 which in turn is supported on a pivot pin 66 connecting the spool flanges 2l and angularly spaced around the core from the pivot all. lVhile the valve 4I naturally tends to close at the proper time in the pumping cycle, it is preferred to provide a spring :il normally urging the valve disk toward closed position. Herein, the spring comprises a wire wrapped around the pin 46 acting in torsion between the spool core and a pin 48 on the yoke i5 to urge the latter and the valve disk 42 toward lthe seat 4Q. The valve 4i is closed when the pressure within the pump chamber is equal to or lower than that in the water distributing system.

Air is admitted to the pump chamber through a check valve 59 which may as shown be of the ball type and located in a passage 5I extending through the upper ange 2 of the spool I5 into the interior of the latter.

During the up stroke of the pump rod 8 in the deep well installation described above, water from the well is drawn into the lower end 0f the drop pipe through the valve 34 as the lower piston 35 rises. rlhe valve 26 is closed so that the head of water above the piston 35 is raised. Owing to the larger displacement of the upper piston 3l, the pressure in the pump chamber is reduced below the atmospheric pressure so that the check valve 50 opens to admit air to the pump chamber corresponding in an amount corresponding to the difference in the piston areas. The water check valve 4I is of course closed at this time.

In the downward stroke, the foot valve 34 closes off the lower end of the drop pipe and the valve 36 opens to permit lowering of the piston 35. The upper piston 3'! thus acts to place the water and air in the pump chamber under pressure forcing the same out through the valve 4I which thus opens automatically, the air inlet valve 5d remaining closed.

The delivery of water to the distributing system during only the down stroke of the pistons is advantageous for several reasons. First, the load on the power actuator is equalized in most deep well installations because the work required to deliver water to the distributing system is substantially equal to that of lifting the water head during the up stroke. Ilhat is to say, the pressure to be maintained in the distributing system may in many installations be correlated with the depth of the well so as to substantially balance the water head to be lifted during the up stroke of the pump. This is contrasted with many prior systems in which the delivery of water on the up stroke as well as during the down stroke results in a greater burden on the power actuator during the up stroke than during the down stroke.

Secondly, it is possible to utilize the pistons of the water pump proper to deliver the required amount of air along with the water thereby avoiding the necessity of providing a separate air pump. In this connection, it will be observed that the combined air and water check valve 4I is located close to the pump chamber proper so as to provide a low clearance volume between the air pump and the air outlet valve. As a result, the internal pressure within the pump chamber will always be reduced below atmospheric pressure and thus enable air to be drawn in through the Valve 5I). The location of the check valve il on the spool I6 is further advantageous in that it is. readily accessible for inspection orrepairl along withthe other operating partsiofthe pump). The novel construction and mounting ot the spool le and the associated water check valve as described above may be utilizedv advantageously in shallow well pumps as illustrated` in Fig. 4 in` which the parte bear the same reerence'numbers as the corresponding parts previously described.

For this use, the air inlet valve w would ordinarily be omitted but other well known means-may be provided, if' necessary, for the introduction of air into the water delivered to the distributing system. Also, the piston Sel and the associate-dJ valve of the deep well pumpshownin Fig. lare omitted andV a valve 55 is provided within the spool at the upper end of the drop pipe i5: To accomplish this, the drop pipe is supported by a fitting 55 screwed into the lower end: of the spool and providing a seat for the disk.` 51 of the-valve E5. With this arrangement, water will be drawn upwardly through the valves 3a and 55 onl the up stroke of the piston 3i during which the outlet valve di will be held closed. On the down stroke, the valves 3d and 5e close automatically and water is forced through the valve d! tothe distributing system.

Mounting of the water check valve 41' directly on the spool le is also advantageous in a shallow well pump for reasons other than to facilitate inspection and repair. In this location, the volurne of' the space subjected to sub-atmospheric pressure during they suction strokeV is reduced to a minimum, thereby providing for an optimum pressure reduction during this stroke. Such a small volume is also advantageous in facilitating priming of the pump andthe maintenance ofthe prime in service operation.

It'will be observed that, except for the provision of the air inlet valve 50 in the deep well pump, the construction of the spool le' and its mounting are identical and therefore may be used alternatively in the deep andshallow well pumps above described. This not only reduces the initial cost of an installation but, simplies and minimizes the cost of conversion in the event that the initial water level in the well falls enough to necessitate the use of a deep well type of pump.

In some water pumps, particularly those of the shallow well reciprocating and jet types, the pumping mechanism proper may belocated outside of the well casing and within an adjacent building. For these installations, the check valve il and other parts would. beomitted on the spool I6 which would be cored out to provide the necessary passages. For example, in one type of jet pump as shown in Fig. 5, parallel drop pipes 51 and 53 supported by the spool i6 wouldcommunicate with separate chambers 5S and et cored in the spool and opening outwardly in registry with separate outlet pipes Si and 62 leading laterally from the well casing 5 to pumping apparatus located at a remote point. In this oase, `an additional land 63 intermediate the endsfof the spool i6 and between the outlets El and t2. is formed with a groove in which. a seal ring e!! is seated. As in the case of the seal rings 25, the ring 64 becomes compressed against an internal cylindrical surface t5 on the spool l5 and thus provides a seal separating the two passages through the spool which is removable from the well casing and replaceable therein the same as inv the. con: structions nrst described.

In each of the pump constructionsd'escribed above the partswliich ordinarily require inspection or repair during the service life ofa pump areimounted on. the spool t6 within: the outer-most@ diameterv of the. seal rings 25 so that the entire assembly may be withdrawn upwardly and. removed from the wellV casing. rIfhis is accom-I plished by removingv the cap` l. after releasing the bolts SiYV andf applying thev lifting force to the lugs 2:3. In the upward movement of the unit, the spool" |S is centered in the pipe 5 by the flange 30so1that theseal rings 25 are he'ldiout of rubbing contact withthe rough wallV of the pipe. Ih'e rings are protected in the same way during. the

original insertion and' thereplacement of. the unit in the casing. Since the downward movement oftheunit is limited by engagement of the spool itself with the abutment 29', none of' the parts need to be dimensioned accurately in the lengthwise direction. After such. replacement, it isl only necessary tov turn the screw 2d dowrr against the lug 23 so as to lock the unit positively against upward. movement.

We claim as our invention:

1. In a pitless pumpY construction, the combination` of, a tubular casing having upper and. lower sections connected by a sleeve with a laterally opening watery outlet therein, axially spaced internal cylindrical surfaces in said sleeve smaller in diameter than the interior of said upper casingsection and disposedabove and below said outlet, an abutment in said sleeve facing axially and upwardly, a drop pipe, a spool supporting saidy pipe and'received in said'sleeve against said abutment so as to be supported thereby, seal rings of yieldable material extending around said spool and respectively engageabl'e .with said surfaces when the spool engages said abutment, and centering means rigid with said spool above said seal rings projecting outwardlytherefrom beyond the outer peripheryof the rings but short of thev lwall of thel upper casing section so as to engage the casing wall during insertion and removal of the spool whereby to prevent rubbing of said seal rings'against the casing wall.

2. In a ypitless pump construction, the combination of, a sleeve forming a part of a well casing and havingv axially spaced inwardly extending flange projections intermediate its ends presenting smooth internal cylindrical surfaces, said sleeve havinganoutlet opening between said'surfaces, a drop pipe, a spool supporting said drop pipean'dhaving external flanges smaller than and spacedto fit within said sleeve projections, seal ringsY of yieldable material seated' in said spool anges and respectively engageable on said projecting surfaces, means on said spool projecting outwardly therefromv beyond the outer periphery of said rings and engageable with the internal Wall of saidV casing during insertion and removal of said spoolto hold said sealrings out of rubbing contact with Ythe wall, and an internal abutment rigid with said 'sleeve and engageable with .the end of vsaid spool to locate said seal rings opposite said projections.

3; In a pitless pump construction, the combinationxof, a tubular sleeve forming apart of a well' casing and having a discharge outlet intermediate itsends, axially spaced and peripherally continuous surfaces` formed around the interior of said sleeve, said, surfaces being smaller in diameter than the interior of the upper part ofA said casing anddisposed above and below said outlet, apipe, a. spool supporting said pipe and having end flanges adapted. to be received in said sleeve in opposite relation. witlirespeet to Vsaid, surfaces, seal rings oi"yi'eldable material'. extending. around saidanges and 'respectively engageable with said surf-aces, at least the upper one of said internal surfaces facing radially inwardly and the ring engaging such surface extending around the outer periphery of the upper flange of said spool, and centering means rigid with said spool above said rings projecting outwardly from the spool flanges beyond the outer periphery of the upper ring but short oi the casing wall and engageable with the latter during insertion and removal of the spool whereby to prevent rubbing of said upper seal ring against said casing wall.

e. In a pitless pump construction, the combination of, a tubular sleeve forming part oi a well casing and having axially spaced internal cylindrical surfaces intermediate its ends set inwardly from the internal sleeve wall, said sleeve having an outlet opening between said surfaces, a drop pipe, a hollow spool supporting said drop pipe and disposed within said surfaces, seal rings of yieldable material seated in and exteding around said spool and respectively engageable with said surfaces, and an external projection of larger radius than the upper one of said rings rigid with said spool above the latter ring and engageable with the casing 4wall during insertion and removal of the spool to hold said seal rings out of rubbing Contact with the wall.

5. In a pitless pump construction, the combination ci, a tubular sleeve forming part of a well casing and having axially spaced internal cylindrical surfaces intermediate its ends of smaller diameter than the inside diameter of the casing above 'the surfaces, said sleeve having an outlet opening between said surfaces, a drop pipe, a hollow spool supporting said drop pipe and disposed within said surfaces, seal rings of yieldable material seated in and extending around said spool and res ectively engageable with said surfaces, and means rigid with said spool above said rings and projecting outwardly therefrom beyond the `outer peripheries of said rings for engagement with said casing wall during insertion and removal of the spool whereby to hold said seal rings out of rubbing contact with the wall, the wall ci said sleeve between said surfaces being undercut around said opening to a radius large enough to prevent damage to said rings when passing said outlet opening during insertion or removal of said. spool.

. e pitless pump construction having, in comn, a well casing having a water outlet opening laterally therefrom and intermediate the ends of the casing, a drop pipe having a pump cylinder therein, a piston reciprocable in said cylinder, a spool with axially spaced flanges supsaid drop ,pipe and insertable endwise in casing, means providing on opposite sides of s id outlet, f uid tight seals between s id flanges and the interior of said casing, said spool having an opening through the core thereof between said seals and terminating in an outwardly facing valve seat, a valve member, an arm pivoted on the exterior of said spool core to swing about an axis paralleling the spool axis and angularly spaced from said valve seat, means pivotally supporting said valve member on the end of said arm to swing about an axis parallel to said iirst asis, and a spring acting on said arm to swing the latter and said valve member toward and into engagement with said valve seat, said spring, said arm and said valve member being disposed within a ,projection of said spool flanges whereby to permit endwise insertion of the spool into and removal of the same from said casing.

'7. A pitless pump construction having, in comd bination, a well casing including an intermediate sleeve having a water outlet opening laterally therefrom, a pipe, a hollow spool supporting said pipe and received in said slee-ve, means providing above and below said outlet iiuid tight seals between the exterior of said spool and the interior of said sleeve permitting endwise insertion of said spool into and removal thereof from said sleeve, said spool having an external recess communicating with said outlet, means on said spool providing a passage connecting said recess with the interior of the spool and the upper end of said pipe and terminating in an outwardly facing annular valve seat, a valve member mounted on said spool within said recess and movable toward and away from said seat into and out of engagement with the latter, said seat and said valve member being disposed when closed within a radius smaller than the upper one of said seals and within the space dened by a projection of said spool flanges, pumping means supported by said pipe within said casing and operable to deliver water upwardly through the pipe and outwardly through said spool passage and said valve, and means normally urging said valve member against said seat to maintain the valve closed when the pumping means is idle.

S. A pump construction having, in combination, a well casing having a water outlet opening laterall,7 therefrom, a drop pipe providing an upper cylinder and a lower cylinder of smaller diameter than said upper cylinder, pistons reciprccable in said cylinders and rigidly conected by a rod extending through the chamber dened by said drop pipe between the pistons, a hollow spool supporting said drop pipe and received in said casing opposite said outlet, means above and below said outlet providing rluid tight seals between the exterior of said spool and the interior of the casing permitting endwise insertion of said spool into and removal thereof from said casing, said spool having a passage therethrough disposed between said seals and communicating with said chamber, a valve including a member mounted on said spool and movable to permit the outow of iluid from said passage to said outlet, and a valve operable automatically in response to a pressure fall in said chamber to a predetermined value to admit air into the chamber at a point between said first valve and said drop pipe.

9. A pump construction having, in combination, a tubular member dening an upper cylinder, a lower cylinder of smaller diameter than the upper cylinder, and an intervening chamber between the cylinders, pistons slidable in the respective cylinders, a rod rigidly connecting said pistons and projecting axially from said member for connection to a power actuator, said member having an outlet opening extending outwardly through the member and communicating with said chamber at a point disposed between said Ipistons, a check valve mounted on said member and closing said opening during one stroke of said rod while permitting an outiiow of fluid during the other piston stroke, and member having a second passage extending therethrough for admitting air to said chamber, and a second normally closed check valve disposed in said second passage to control the ow or" air therethrough and adapted to open automatically in response to a fall in pressure within said chamber to a predetermined value, said member, said pistons, and said valves constituting a unitary assembly adapted for endwise 9 insertion into and removal from a well casing.

10. In a pitless well construction, the combination of, a tubular sleeve forming part of a well casing and having a discharge opening intermediate its ends, a hollow spool having spaced flanges and an opening therebetween, said spool being disposed within said sleeve with said openings communicating with each other, a pipe supported by said spool and communicating with the interior thereof, means deiining a iiuid tight seal between the interior of said sleeve and the lower flange of said spool, the coacting elements of said seal being brought into engagement during lowering of the spool and pipe into said sleeve, a ring of yieldable material encircling the upper spool flange and engaging an internal surface on said sleeve to form a fluid tight seal, and centering means on said spool above said seals and projecting outwardly from the spool beyond the outer periphery of said ring but short of the internal wall of said sleeve so as to engage said wall during insertion and removal of the spool and prevent rubbing of said ring against the wall.

11. A pitless pump construction having, in combination, a well casing having a water outlet opening laterally therefrom and intermediate the ends of the casing, a spool having ilanges at opposite ends of a hollow core and a passage extending outwardly from the interior of the core and having an annular valve seat formed therein, a pipe suspended from the lower end of said spool in communication with the interior of said core, said spool with said pipe supported thereon being insertable endwise in said casing to bring said passage into communication with said casing outlet, means providing fluid tight seals between the anges of said spool and the internal wall of said casing above and below said outlet opening whereby to coniine the ow of water from said pipe into the interior of said spool and outwardly through said passage to said outlet opening, pumping means supported on said pipe within said casing and operable to deliver liquid upwardly through the pipe and spool to said outlet, a valve member carried by said spool within the periphery of one of said anges and movable toward and away from said seat so as to be opened automatically in response to the delivery of water upwardly through said pipe into said core, and means urging said valve member toward said seat to maintain the valve closed when said pumping means is idle.

12. A pitless pump construction having, in combination, a well casing having a water outlet opening laterally therefrom and intermediate the ends of the casing, a spool having ilanges at opposite ends of a hollow core and a recess around said core and between said flanges, a pipe suspended from the lower end of said spool in communication with the interior of said core, said spool with said pipe supported thereon being insertable endwise in said casing to bring said recess into communication with said casing outlet, a valve seat surface located in an upright plane in said recess of said spool core and facing outwardly from the core but spaced inwardly from said well casing, means providing iiuid tight seals between the iianges of said spool and the internal wall of said casing above and below said outlet opening whereby to confine the iiow of water from said pipe into the interior of said spool and outwardly through said passage to said outlet opening, pumping means supported on said pipe within said casing and operable to deliver liquid upwardly through the pipe to the interior of said spool core, there being at least one passage extending through said spool core and said seat surface to establish communication between said pipe and said outlet when the passage is uncovered, a valve member carried by said spool and movable within said recess toward and away from said seat surface to cover said passage and be opened automatically in response to the delivery of water upwardly through said pipe into said core, and means urging said valve member toward said seat to maintain the valve closed when said pumping means is idle.

JOHN GORDON BAKER. LYELL C. TULLIS. LOUIS T. WATRY.

References Cited in the le of this patent UNITED STATES PATENTS Number Name Date 1,448,018 Willers Mar. 13, 1923 1,901,031 Humason Mar. 14, 1933 2,122,020 Barks June 28, 1938 2,252,773 Lageson Aug. 19, 1941 2,578,669 Buttereld Dec, 18, 1951 

